Accentuating mechanism for pneumatic players.



G. P. BRAND.

AGGENTUATING MECHANISM FOR PNEUMATIC PLAYERS.

APPLICATION FILED JAN. 16. 1906.

Patented June 7, 1910.

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ANDREW B GRAHAM (:0v PHOTO-LI" .OGRAPNiRS WASHINGTON. at;

G. P. BRAND. ACGENTUATING MECHANISM FOBPNEUMATIG PLAYERS.

APPLICATION FILED JAN. 16. 1906.

960,262, Patenteda-June 7, 1910.

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G.P.BRAND., I AGUBNTUATING MECHANISM FOR PNEUMATIC PLAYERS.

APPLICATION FILED JAN.16, 1906.

Patented June 7, 1910.

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G. P. BRAND.

AGGENTUATING MEGHANISMTOR PNEUMATIC PLAYERS.

APPLIOATION rum) JAN. 16. 1906. I 960,262. Patented June 7, 1910.

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UNITED STATES PATENT OFFICE.

GEORGE 1?. BRAND, OF NEW YORK, N. Y.

ACGENTUATING MECHANISM FOR PNEUMATIC PLAYERS.

To all whom it may concern:

Be it known that I, Gnonon P. BRAND, a citizen of the United States,residing in the borough of Bronx, city, county, and State of New York,have invented certain new and useful Improvements in AccentuatingMechanism for Pneumatic Players, of which the following is aspecification.

My invention relates to pneumatic musical apparatus in which a variabletension pneumatic is employed having a throttle which controlscommunication between the exhaust mechanism and the wind chest withwhich the sound actuating pneumatics are connected, as set forth in myconcurrent applications No. 202,543 filed April 11th, 1904, and N 0.281,835 filed October 7th, 1905, both of which cases are designed toafford means whereby a so called normal tension or pressure in the windchest may be set or regulated or varied temporarily, and whereby thedegree of tension thus prescribed for the wind chest may be maintainedautomatically with a minimum degree of fluctuation from normal.

The essential and distinguishing feature of my present inventionconsists in combining with a variable tension bellows preferably but notnecessarily, of the character designated an accentuating pneumatic andconnections whereby resistance to the closing of the throttle in thevariable tension bellows may be temporarily, but immediately andforcefully increased, so as to suddenly increase the tension in the windchest by reason of the withdrawal therefrom of a greater proportion ofair through the throttle by means of the exhaust mechanism for thepurpose of accentuating certain notes in the music, as hereinafter morefully described and explained.

- I have herein shown and described my accentuating pneumatic asarranged to operate in conjunction with the variable tension bellows setforth in my concurrent application No. 281,835 filed October 7th, 1905,which is a preferred combination of parts on account of the extent ofmotion available for the manipulation of the throttle, although I do notrestrict myself to the use v of this particular construction of variablethe exhaust mechanism.

Specification of Letters Patent.

Applicationv filed January 16, 1906.

Patented June *7, 1910.

Serial No. 296,311.

My invention also includes the combination and arrangement with the windchest, variable normal tension bellows, accentuating pneumatic, and.exhaust mechanism, of certain pneumatic valves for actuating andcontrolling the parts in various ways to change the tension in the windchest, as hereinafter described and claimed specifically.

One of the important and distinguishing advantages attained by mypresent invention is that I am enabled to control and vary the normaltension independent of the main tension reservoir, and at the same timeeffect accentuation which is directly proportionate and related to theexisting normal ten sion.

In the accompanying drawings, Figure 1, shows diagrammatically thearrangement of parts when the variable normal tension bellows isconnected with a main, storage bellows interposed between it and theexhaust mechanism; Fig. 2, shows diagrammatically the arrangement ofparts whereby the normal tension bellows may be cut off temporarily fromcommunication with the wind chest, and the latter thrown into directconnection with the main storage or exhaust bellows; Fig. 3, showsdiagrammatically a modification in which the exhaust is connecteddirectly with the variable tension chamber; Fig. 4, is a sectionalelevation upon an enlarged scale taken upon plane of line Fig. 1; Fig.5, is a sectional elevation upon an enlarged scale taken upon plane ofline 55 Fig. 3; Fig. 6, is a sectional elevation showing the normalposition of the variable tension bellows and the accentuating pneumatic;Fig. 7, is a sectional elevation illustrating the action of theaccentuating pneumatic; Fig. 8, is a sectional detail'of the clutch atrest; Fig. 9, is a similar View of the clutch in action; Fig. 10, is arear view of the parts as shown in Fig. 8.

In the drawings W represents a wind chest of any desired constructionwith which the sound actuating pneumatics are oonnected,-said wind chestW being also in communication, either directly or indirectly, with thevariable tension bellows A, the latter in turn communicating eitherdirectly or indirectly with the exhaust mechanism E. Thus, in thesimpler arrangement shown in Fig. 3, the variable tension bellows A, isconnected directly with the exhaust mechanism E, while in Figs. 1 and 2,it is connected with a main storage bellows M interposed between it andthe exhaust, E, the only diflerence being that in the arrangementillustrated in Fig. 2, provision is made for throwing the wind chest Winto direct connnunication with the main storage of the exhaust when anunusually quick, full, and powerful accentuation is required.

In order to set forth an operative device and afiord a clearunderstanding of the invention, it will be necessary to describesomewhat in detail the construction of the variable tension chamber A,although it forms the subject matter of a separate ap plication forpatent as hereinbefore stated. It consists essentially of a stationarymemher A, and a movable member A the parts being united in the usual wayby flexible material a. A long sensitive spring S, is interposed betweenthe two members A A and tends constantly to separate them, even againstinternal tension. The interior of the variable tension bellows A is inall cases put in communication either directly, or through interveningconduits with the wind chest \V (shown symbolically in the drawings) bymeans of a suitable air conduit or duct a.

Pivotally attached to the stationary member A, of the bellows A, is anadjustable port block B, communicating through a hollow trunnion 5, (seeF i 5) upon which it is fulcrumed with an exhaust duct I), whichconnects either directly with the exhaust mechanism E, as shown in Fig.3, or indirectly therewith through the medium of the main storage ortension reservoir M, as shown in Figs. 1 and 2. The hollow trunnion b,is supported in the stationary bearing blocks a a through the latter ofwhich the exhaust duct extends. The sides of the port block B, areformed with the ports 2), 7;, and its position in the bellows isregulated and controlled manually or otherwise by means of a rod (Z,pivotally connected to the port block, and extending through a packedguide 6 in the stationary member of the bellows. Pivotally secured toopposite sides of the adjustable port block B, are valve blades V, V,(see Fig. a) which are also pivotally connected to the movable member Aof the bellows by means of the links d d. The sides of the valve bladesV, V, opposed to the port block B are faced with leather or otherpacking to insure a close frictional contact therewith.

The adjustable port block B, being set (as in Fig. 6) to represent aprescribed de gree of tension in the wind chest XV, any air admitted tothe latter through the note sounding pneumatics will inflate the bellowsA, more or less and thereby cause the valve blades V V, to increase theavailable area of the ports 77, 'n'oportionately, which will allow thetension reservoir M and exhaust mechanism E, to quickly withdraw suchexcess of air. As the prescribed normal tension is thus restored in thewind chest V the increase of tension in the bellows A, causes itsmovable member A to collapse and close the ports 7), more or less,according to the difference in tension existing in the tension reservoirM or exhaust mechanism E, as compared with that in the wind chest. Thusthe tension in the main storage reservoir M or exhaust mechanism E,being greater than in the wind chest the movable member A of thevariable normal tension bellows A will move toward the stationary memberA, sufiiciently to cause the valve blades V, V, to close the ports 7),entirely until air admitted to the wind chest V as before stated againreduces the degree of tension therein, and allows the movable member Aof the bellows A to move away from the stationary member A, under theaction of the spring S, and these pulsations will be repeatedcontinuously and automatically during the operations of theapparatus,the number and extent of the fluctuations being dependent uponthe character and requirements of the music executed. This much for thefunctions and operations of the variable tension bellows under ordinaryconditions when set to a prescribed normal tension by means of theadjustable port block through the medium of the rod (Z.

Then it is desirable to temporarily and quickly increase the tension inthe bellows A, without resorting to or disturbing the adjustment of theport block B which it is expedient to maintain for the time being at aprescribed normal or general expression tension, I increase the tensionin the interior of the bellows A, and hence in the wind chest TV byincreasing the opposition to the collapse of the movable member A inwardby means of auxiliary pressure applied externally to said movable memberA thereby preventing the valve blades V, V, from reducing the area ofthe ports in the block B,the object being to accentuate particular notesin the music under execution. It is true that the result might beattained in a certain degree by the manipulation of the adjustable portblock B, by means of the rod (Z, butthis would disturb the prescribed ordesired normal or expression tension, to which the port block would haveto be readjusted. Hence I employ an auxiliary device which willtemporarily, but quickly, increase the tension without disturbing theconditions by which the normal tension is maintained for the time being,and this auxiliary device and connections I designate as an accentuatorC, which consists essentially of a pneumatic P the movable member 1), ofwhich is coupled to the movable memsary or most convenient, provided itis in sufficiently close proximity to the normal tension bellows A toadmit of the movable member 7) being coupled to the movable member (Athereof substantially as hereinafter set forth. The interior of theaccentuating pneumatic P is normally in communication with theatmosphere through the medium of an air duct 7), which enters the airchamber f, in the valve chest F, said air chamber 7, bein formed with avalve seat f, through which extend ports f communicating with theatmosphere. In the air chamber 7, is also another valve seat f formedwith ports f, communicating with a tension chamber f connected by a duct7, with the main storage tension reservoir M, as in Figs. 1 and 2, ordirectly with the variable normal tension bellows A by a duct f as shownin Fig. 3, which Variable tension bellows in this arrangement of partsperforms the function of a main storage tension as well as that of anormal tension chamber owing to the fact that it controls and throttlescommunication between the wind chest WV and the exhaust mechanism Edirectly, instead of indirectly through the main storage tension chamberM.

The disk valve g', on the rod 9, rests normally on the seat f, thusclosing communication with the main tension storage. The lower end ofthe valve rod 9, rests upon a diaphragm f, in the lower part of thetension chamber 7*, the space beneath said diaphragm f, being connectedby a duct h, with an air valve it, held normally against its seat by aspring 713, interposed between a stationary part and the head or pushbutton it. When it is desired to partly deflate the pneumatic P toaccentuate certain notes of the music, the button if, is depressedagainst the resistance of the spring h thereby admitting air underneaththe diaphragm 7, which, owing to the tension in the chamber f acts onthe rod g, to raise the valve 9, from the seat f and press it againstthe seat f, thereby closing the air ports f while opening the ports f,in the seat f As a result the air is withdrawn from the pneumatic Pthrough the duct p chamber f, ports f chamber f duct f, or f mainstorage tension reservoir M (or through the variable tension chamber Aacting as a tension reservoir) and exhaust mechanism E. When the fin erbutton is released, the spring 72?, immediately returns the valve 71/,to its seat, closing off the supply of air from beneath the diaphragm 7,which is formed with a bleed hole through which the air escapes into thetension chamber F, the exhaust being sufficient to compensate for anyleak through the bleed hole when the diaphragm is inflated. The collapseof the diaphragm f lowers the valve 9, to the seat f shutting offcommunication between the tension chamber f and the air chamber f, andadmitting air to the latter, and thence to the interior of the pneumaticP, which is again inflated.

The inward thrust of the movable member 7), of the actuating pneumaticP, is imparted to the movable member A of the variable normal tensionbellows through the medium of a coupling rod 2', pivotally connected tothe movable member A of the bellows A, and extending through andslidable within a hole 2", in the clutch I which in turn is pivotallyconnected to the movable member p, of the accentuating pneumatic P. Thediameter of the aperture 2', is very little larger than the diameter ofthe rod 2', and the curvature of the rod 2', is such that when thepneumatic P is inflated and at rest as shown in Figs. 1, 2, 3 and 6, therod is free to move back and forth through the clutch I to adapt itselfto the changes in position of the movable member A of the bellows A,under the variations in tension caused by the, music sounding pneumaticsconnected with the wind chest IV. Immediately however upon the beginningof the partial deflation of the accentuating pneumatic P as hereinbeforedescribed, the clutch I by reason of its pivotal connection with themovable member 7), of the pneumatic, pinches or clamps the portion ofthe rod 2', in engagement with the hole a, as shown in Fig. 9. Thispinching action is insured by means of a spring 2' which tendsconstantly to rock the clutch I backward on its pivot and into rigidengagement with the rod 2', this tendency being counteracted when thepneumatic A is inflated and the parts are at rest, by a stop j, whichengages the upper end of the clutch I and sustains it in such positionthat the sides of the hole i, have little or no bearing upon the rod 6,which is thus free to move back and forth without actual engagement withthe pneumatic P. The stop which uncouples the rod i, from the clutch Iis adjustable so as to regulate its action with relation to the positionof the stop k, which limits the outward thrust of the movable member p,of the pneumatic P, said stop is, being also adjustable so that thepneumatic P may be set to a prescribed degree of inflation. Thus thestop is, being set to determine the limit of outward play or movement ofthe movable member 2), of the pneumatic P, the stop j, is then set totrip or release the catch I at the end of such movement. In other wordsthe stops j and 70, act simultaneously and in conjunction with eachother, the stop in, relieving the stop j and clutch I of all. strainwhile the parts are at rest. It is obvious that either or both of thesestops j and 7; may be adjustably mounted upon any suitable stationarysupport adjacent to the pneumatic P and I do not limit myself to thearrangement of parts shown, in which the stop consists of a nut on ascrew 0, which is pivotally connected to a lug piece k attached to thestationary member p, of the pneumatic P said nut bearing against a lugor extension 70 on the movable section 12, of said pneumatic P, whilethe stop j, is carried upon a rod j, the inner end of which is threaded,and passes through an eye or bearing j on the stationary member of thepneumatic where it engages with a nut 3' by which the position of thestop 7', may be regulated with relation to the said stationary member72, and hence with relation to the stop 75, as above set forth. It willthus be seen that whenever the pneumatic P is partially deflated thepressure of the atmosphere exerted against its movable member 7), willbe suddenly transmitted to the movable member AF, of the bellows A, insuch manner as to cause the valve blades V, V, to immediately increasethe available port area, with the re sult that there is an instantaneousincrease of tension in the wind chest IV for the pur pose set forth,which however drops back to the prescribed normal tension as soon as theactuating pneumatic P is again inflated.

My auxiliary accentuating device is adapted for practical applicationand use in various ways. That shown in Fig. 3, is an illustration of oneof the simplest, in which the tension chamber f is connected directlywith the variable normal tension bellows A through the medium of theconduit f which is the equivalent of the conduit f, shown in Fig. 1, theadjustable port block B in said bellows A, being in turn directlyconnected with the exhaust mechanism E through the medium of the ductZ), which is the equivalent of the duct 7), in Fig. 1, the results inall respects in both arrangements being essentially the same in that theaccentuating pneumatic P acts to create a temporary but decided increaseof tension within the wind chest IV. The arrangement shown in Fig. 2, isnot materially different from the others, the main distinction beingthat provision is made for ordinary accentuation by means of thepneumatic A, but also for extraordinary or very powerful accentuationwhen desired by means which admit of the wind chest IV being throwntemporarily into direct communication with the main tension storagereservoir M. This I accomplish by connecting the wind chest d not a,with the middle chamber Z, of a alve chest I1. having end chambers Z,and Z connected respectively by means of the duct m, with the mainstorage tension reservoir M, and by means of the duct (4, with thevariable normal tension bellows A. The partitions Z and P, which dividethe chest L into three compartments Z, Z, Z are each formed with portsand valve seats opening into the central compartment Z. These ports areclosed alternately by valves 11, 91 on a rod N the opposite ends ofwhich abut against diaphragms Z, Z. The space back of the diaphragm Z,communicates with the atmosphere through a hole Z in the end of thechest L, and the space back of the other diaphragm Z communicatesthrough a duct Z with a middle chamber 1*, in a secondary valve chestIt, which is formed with an air chamber 1-, connecting with theatmosphere and with a tension chamber r communicating through the duct9, with the tension chamber Z, in the valvechest L. In the lower part ofthe chamber T is a diaphragm 1*, upon which rests the lower end of avalve stem 8, said stem carrying two valves 8, and 8 arrangedrespectively to engage alternately with seats in the partitions whichseparate the middle chamber 1, from the others. The space under thediaphragm 1-, communicates through the duct 6, with the valve seat t,upon which the valve 1), is held 1101* mally by the spring w, interposedbetween a stationary part and the finger button a, on the uper end ofthe valve stem 0 In Fig. 2, the parts are shown in their normalpositions with relation to each other in which condition the wind chestIV is in communication with the variable tension bellows A, and theordinary requirements of accentuation are met by the use of thepneumatic P to increase the tension within the said bellows A. lVhenunusually sudden and powerful accentuation is desired,'the valve 71,, isdepressed against the resistance of the spring 72 by means of the fingerbutton [L3, thus admitting air through the ducth, to the underside ofthe diaphragm 7, which thereupon raises the valve stem until the valve7", rests against the seat Consequently the interior of the pneumatic Iis put in communication with the wind chest IV through the medium of theconduit a, tension chamber A, duct f and chamber 7, thereby tending todeflate the pneumatic P and cause the clutch I to act on the rod 2', toforce the movable member A of the tension bellows A back, to increasethe tension within said bellows A.

The bellows A for convenience of description may be called a variabletension expression bellows, as in my concurrent application No. 281,835filed Oct. 7, 1905, and

I so designate it in the accompanying claims. Certain features hereinshown and claimed are shown but not claimed in my eo-pending applicationSerial No. 381,418.

IVhat I claim as my invention and desire to secure by Letters Patent is,

1. In pneumatic apparatus of the character designated, the combinationwith the wind chest and exhaust mechanism and ducts leading thereto froma variable tension bellows, of said variable tension bellows, having aninternal throttle interposed between a duct leading to the exhaustmechanism and a duct leading to the wind chest, said throttle beingcontrolled by the movable member of said bellows, an auxiliaryaccentuating pneumatic, means for inflating and deflating the latter,and means for coupling its movable member to the movable member of thesaid variable tension bellows when said accentuating pneumatic isdeflated, for the purpose described.

2. In pneumatic apparatus of the character designated, the combinationwith the wind chest and exhaust mechanism and ducts leading thereto froma variable tension bellows, of said variable tension bellows, hai ing aninternal throttle interposed between a duct leading to the exhaustmechanism and a duct leading to the wind chest, said throttle beingcontrolled by the movable member of said bellows, an auxiliaryaccentuating pneumatic, means for inflating and deflating the latter, a.coupling rod pivotally connected to the movable member of the saidvariable tension bellows and slidable in a clutch 011 the movable memberof the accentuating pneumatic, and said clutch arranged to automaticallypinch and hold the coupling rod rigidly during the deflation of theaccentuating pneumatic, for the purpose described.

3. In pneumatic apparatus of the character designated, the combinationwith the wind chest and exhaust mechanism and ducts leading thereto froma variable tension bellows, of said variable tension bellows, having aninternal throttle interposed between a duct leading to the exhaustmechanism and a duct leading to the wind chest, said throttle beingcontrolled by the movable member of said bellows, an auxiliaryaccentuating pneumatic, means for inflating and deflating the latter, acoupling rod pivotally connected to the movable member of said variabletension bellows and slidable in a clutch on the accentuating pneumaticsaid clutch pivotally connected to the movable member of theaceentuating pneumatic and formed with an aperture for the reception ofthe coupling rod, said aperture being of approximately the same width asthe diameter of the coupling rod, a spring which tends constantly tocause the clutch to pinch the coupling rod, and a stop arranged todisconnect the clutch from the rod when the accentuating pneumatic isinflated, for the purpose described.

4. In pneumatic apparatus of the character designated, the combinationwith the wind chest and exhaust mechanism and ducts leading thereto froma variable tension bellows, of said variable tension bellows, having aninternal throttle interposed between a duct leading to the exhaustmechanism and a duct leading to the wind chest, said throttle beingcontrolled by the movable member of said bellows, an auxiliaryacccntuating pneumatic, means for inflating and deflating the latter, acoupling rod pivotally connected to the movable member of said variabletension bellows and slidable in a clutch on the accentuating pneumatic,said clutch pivotally connected to the movable member of theaccentuating pneumatic and formed with an aperture for the reception ofthe coupling rod, said aperture being of approximately the same width asthe diameter of the coupling rod, a spring which tends constantly tocause the clutch to pinch the coupling rod, and a stop arranged todisconnect the clutch from the red when the accentuating pneumatic isinflated, and means for adjusting said stop with relation to thestationary member of the accentuating pneumatic for the purposedescribed.

5. In pneumatic apparatus of the character designated, the combinationwith the wind chest and exhaust mechanism and ducts leading thereto froma variable tension bellows, of said variable tension bellows, having aninternal throttle interposed between a duct communicating with theexhaust mechanism and a duct communicating with the wind chest, saidthrottle being controlled by the movable member of said bellows, acoupling rod pivotally connected to the movable member of said variabletension bellows and slidable in a clutch on an accentuating pneumatic,said accentuating pneumatic, said clutch pivotally connected to themovable member of the accentuating pneumatic and formed with an aperturefor the reception of the coupling rod, said aperture being ofapproximately the same width as the diameter of the coupling rod, aspring which tends constantly to cause the clutch to pinch the couplingrod, a stop arranged to limit the outward movement of the movable memberof the accentuating pneumatic when inflated, and a stop arranged todisconnect the clutch from the coupling red when the movable member ofthe accentuating pneumatic encounters the said first mentioned stop, forthe purpose described.

6. In pneumatic apparatus of the character designated, the combinationwith the wind chest and exhaust mechanism and ducts leading thereto froma variable tension bellows, of said variable tension bellows, having aninternal throttle interposed between a duct communicating with theexhaust mechanism and a duct communicating with the wind chest, saidthrottle being controlled by the movable member of said bellows, acoupling rod pivotally connected to the movable member of said variabletension bellows and slidable in a clutch on an accentuating pneumatic,said accentuating pneumatic, said clutch pivotally connected to themovable member of the accentuating pneumatic and formed with an aperturefor the reception of the coupling rod, said aperture being ofapproximately the same width as the diameter of the coupling rod, aspring which tends constantly to cause the clutch to pinch the couplingrod, an adjustable stop arranged to limit the outward movement of themovable member of the accentuating pneumatic when inflated and anadjustable stop arranged to disconnect the clutch from the coupling rodwhen the movable member of the accentuating pneumatic encounters thesaid first mentioned adjustable stop, for the purpose described.

7. In pneumatic apparatus of the charac ter designated the combinationwith the wind chest, and exhaust mechanism, and with a variable tensionbellows communicating with the wind chest and having an adjustable portblock communicating with the exhaust mechanism and pivotally mountedupon the stationary member of the bellows, and a pivoted valve platelinked to the movable member of the bellows, of an auxiliaryaccentuating pneumatic, means for inflating and deflating the latter,and means for coupling its movable member to the movable member of thesaid variable tension bellows when said accentuating pneumatic isdeflated, for the purpose described.

8. In pneumatic apparatus of the character designated the combinationwith the wind chest, and exhaust mechanism, and with a variable tensionbellows communicating with the wind chest and having an adjustable portblock communicating with the exhaust mechanism and pivotally mountedupon the stationary member of the bellows, and a pivoted valve platelinked to the movable member of the bellows, of an auxiliaryaccentuating pneumatic means for inflating and deflating the latter, acoupling rod pivotally connected to the movable member of the saidvariable tension bellows and slidable in a clutch on the movable memberof the accentuating pneumatic, and said clutch arranged to automaticallypinch and hold the coupling rod rigidly during the deflation of theaccentuating pneumatic, for the purpose described.

9. In pneumatic apparatus of the character designated, the combinationwith the wind chest, and exhaust mechanism, and with a variable tensionbellows communieating with the wind chest and having an adjustable portblock communicating with the exhaust mechanism and pivotally mount? edupon the stationary member of the bellows, and a pivoted valve platelinked to the movable member of the bellows of an auxiliary accentuatingpneumatic, means for i11- flating and deflating the latter, a couplingrod pivotally connected to the movable member of said variable tensionbellows and slidable in a clutch on the accentuating pneu matic, saidclutch pivotally connected to the movable member of the accentuatingpneumatic and formed with an aperture tor the reception of the couplingrod, said aperture being of approximately the same width as the diameterof the coupling rod, a spring which tends constantly to cause the clutchto pinch the coupling rod, and a stop arranged to disconnect the clutchfrom the rod when the accentuating pneumatic is inflated tor the purposedescribed.

10. In pneumatic apparatus of the character designated, the combinationwith the wind chest, and exhaust mechanism, and with a variable tensionbellows communicating with the wind chest and having an adjustable portblock communicating with the exhaust mechanism and pivotally mountedupon the stationary member, of the bellows, and a pivoted valve platelinked to the movable member of the bellows, of an auxiliaryaccentuating pneumatic, means for inflating and deflating the latter, acoupling rod pivotally connected to the movable member of said variabletension bellows and slidable in a clutch on the accentuating pneumatic,said clutch pivotally connected to the movable member of theaccentuating pneumatic and formed with an aperture for the reception or"the coupling rod, said aperture being of approximately the same width asthe diameter of the coupling rod, a spring which tends constantly tocause the clutch to pinch the coupling rod, and a stop arranged todisconnect the clutch from the rod when the accentuating pneumatic isinflated, and means for adjusting said step with relation to thestationary member of the accentuating pneumatic, for the purposedescribed.

11. In pneumatic apparatus of the character designated, the combinationwith the wind chest, and exhaust mechanism, and with a variable tensionbellows communicating with the wind chest and having an adjustable portblock communicating with the exhaust mechanism and pivotally mountedupon the stationary member of the bellows,

and a pivoted valve plate linked to the mov-- able member of thebellows, of an auxiliary accentuating pneumatic, means for inflating anddeflating the latter, a coupling rod pivotally connected to the movablemember of said variable tension bellows and slidable in a clutch on theaccentuating pneumatic,

bellows and the wind chest and pl'itting the I said clutch pivotallyconnected to the movable member of the accentuating pneumatic and formedwith an aperture for the reception of the coupling rod, said aperturebeing of approximately the same width as the diameter of the couplingrod, a spring which tends constantly to cause the clutch to pinch thecoupling rod, a stop arranged to limit the outward movement of themovable member of the accentuating pneumatic when inflated, and a stoparranged to disconnect the clutch from the coupling rod when the movablemember of the accentuating pneumatic encounters the said first mentionedstop, for the purpose described.

12. In pneumatic apparatus of the character designated the combinationwith the wind chest, and exhaust mechanism, and with a variable tensionbellows communicating with the wind chest and having an adjustable portblock communicating with the exhaust mechanism and pivotally mountedupon the stationary member of the bellows, and a pivoted valve platelinked to the movable member of the bellows, of an auxiliaryaccentuating pneumatic, means for inflating and deflating the latter, acoupling rod pivotally connected to the movable member of said variabletension bellows and slidable in a clutch on the accentuating pneumatic,said clutch pivotally connected to the movable member of theaccentuating pneumatic and formed with an aperture for the reception ofthe coupling rod, said aperture being of approximately the same width asthe diameter of the coupling rod, a spring which tends constantly tocause the clutch to pinch the coupling rod, an adjustable stop arrangedto limit the outward movement of the movable member of the accentuatingpneumatic when inflated, and an adjustable stop arranged to disconnectthe clutch from the coupling rod when the movable member of theaccentuating pneumatic encounters the said first mentioned adjustablestop, for the purpose described.

13. In pneumatic apparatus of the character designated the combinationwith the wind chest and exhaust mechanism and ducts leading thereto froma variable tension bellows, of said variable tension bellows, having aninternal throttle interposed between the ducts leading to the exhaustmechanism and a duct leading to the wind chest, said throttle beingcontrolled by the movable member of the said bellows, an auxiliaryaccentuating pneumatic, means for inflating and deflating the latter,means for coupling the movable member of the variable tension bellows tothe movable member of the accentuating pneumatic when the latter isdeflated, and means for simultaneously closing communication betweensaid variable tension latter in direct communication with the exhaustmechanism, for the purpose described.

14;. In pneumatic apparatus of the character designated the combinationwith the wind chest, and exhaust mechanism, and with a variable tensionbellows communicating with the wind chest and having an adjustable portblock communicating with the exhaust mechanism and pivotally mountedupon the stationary member of the bellows, and a pivoted valve platelinked to the movable member of the bellows, of an auxiliaryaccentuating pneumatic, and means for simultaneously closingcommunication between said variable tension bellows and the wind chestand putting the latter in direct communication with the exhaustmechanism for the purpose described.

15. In pneumatic apparatus for the purpose designated, the combinationof a variable tension bellows, an auxiliary accentuating pneumatic,means for inflating and deflating the latter, and means for coupling itsmovable member to the movable member of the said variable tensionbellows when said accentuating pneumatic is deflated, for the purposedescribed.

16. In pneumatic apparatus for the purpose designated, the combinationof a vari able tension bellows an auxiliary accentuating pneumatic,means for inflating and deflating the latter, a coupling rod pivotallyconnected to the movable member of the said variable tension bellows andslidable in a clutch on the movable member of the accentuatingpneumatic, and said clutch arranged to automatically pinch and hold thecoup ling rod rigidly during the deflation of the accentuating pneumaticfor the purpose described.

17. In pneumatic apparatus for the purpose designated, the combinationof a variable tension bellows, mechanical means for regulating thetension therein, an auxiliary accentuating pneumatic, means forinflating and deflating the latter, and means for coupling its movablemember to the movable member of the said variable tension bellows whensaid accentuating pneumatic is deflated, for the purpose described.

18. In pneumatic apparatus for the purpose designated, the combinationof a variable tension bellows, an auxiliary accentuating pneumatic,means for inflating and deflatingthe latter, a coupling rod pivotallyconnected to the movable member of the said variable tension bellows andslidable in a clutch on the movable member of the accentuatingpneumatic, and said clutch arranged to automatically pinch and hold thecoupling rod rigidly during the deflation of the accentuating pneumatic,for the purpose described.

19. The combination of a wind chest, a

main tension reservoir, a variable tension bellows connected therewithand with the wind chest, mechanical means in conjunction with saidvariable tension bellows for producing the desired normal tension in thewind chest, an auxiliary accentuating pneumatic, means for inflating anddeflating the latter, and movable clutch means for coupling the movablemember of the variable tension bellows with the movable member of theauxiliary accentuating pneumatic when the latter is deflated.

20. The combination with a variable tension bellows and an auxiliarybellows normally disconnected therefrom, of mechanical means forconnecting the auxiliary bellows with the variable tension bellows atany position of the movement of the latter.

21. In pneumatic apparatus for the purpose designated, the combinationor a variable tension expression bellows, a port block mountedadjustably upon one member of said bellows, means for connecting saidadjustable port block with a tension reservoir or exhaust mechanism, avalve blade connected with the other member of the bel lows, means foradjusting said port block with relation to said valve blade, means forconnecting the interior of the bellows with a working tension windchest, an auxiliary accentuating pneumatic, means for inflating anddeflating the latter, and means for coupling its movable member to themovable member of said variable tension expression bellows when saidauxiliary accentuating pneumatic is deflated for the purpose described.

22.111 pneumatic apparatus for the purpose designated, the combinationof a variable tension expression bellows, a port block mountedadjustably upon one member of said bellows, means for connectin saidadjustable port block with a tension reservoir or exhaust mechanism, avalve blade connected with the other member of the bellows, means foradjusting said port block with relation to said valve blade, means forconnecting the interior of the bellows with a working tension windchest, an auxiliary accentuating pneumatic, means for inflating anddeflating the latter, a coupling rod pivotally connected to the movablemember of the variable tension expression bellows and slidable in aclutch on the movable member of the auxiliary accentuating pneumatic,and said clutch arranged to automatically pinch and hold the couplingrod rigidly during the deflation of said accentuating pneumatic, for thepurpose described.

23. In pneumatic apparatus of the character designated the combinationof a variable tension expression bellows, a port block mountedadjustably upon one member of the bellows, means for connecting saidport block with a tension reservoir or exhaust mechanism, a valve bladepivotally connected with the other member of the bellows and pivotallyconnected to the adjustable port block, means for adjusting said portblock with relation to said valve blade, a spring tending constantly toseparate the members of the bellows, means for connecting the interiorof the bellows with a working tension wind chest, an auxiliaryaccentuating pneumatic, means for inflating and deflating the latter, acoupling rod pivotally connected to the movable member of the variabletension expression bellows and slidable in a clutch on the movablemember of the auxiliary accentuating pneumatic, and said clutch arrangedto automatically pinch and hold the coupling rod rigidly during thedeflation of said accentuating pneumatic, for the purpose described.

2%. In pneumatic apparatus of the character designated the combinationof a variable tension expression bellows, a hollow movable port blockformed with ports in its opposite side walls and supported on one memberof the bellows, a hollow fulcrum upon which the said port block ismounted connnunicating with a tension reservoir or exhaustmechanism.valve blades linked to the other member of the bellows and pivotallyconneeted to opposite sides of the said adjustable port block, means foradjusting the said port block with relation to the said valve blades,means which tend constantly to separate the members of the bellows,means for connecting the interior of the bellows with a working tensionwind chest. an auxiliary accentuating pneumatic, means for inflating anddeflating the latter, a coupling rod pivotally connected to the movablemember of the variable tension expression bellows and slidable in aclutch on the movable member of the auxiliary accentuating pneumatic,and said clutch arranged to automatically pinch and hold the couplingrod rigidly during the deflation of said accentuating pneumatic, for thepurpose described.

25. The combination with a variable ten sion bellows, of means forvarying the tension, means for controlling the tension, a pneumatic andclutch means operable in conjunction therewith for the purposes ofaccentuation.

26. The combination with a variable tension bellows, of means forvarying the tension, means for controlling the tension, a pneumatic andautomatic additional clutch means for the purposes of accentuation, alloperating in conjunction with said bellows.

2'7. The combination with a variable tension bellows, of means forvarying the tension, means for controlling the tension in said bellows,and elutclrcontrolled means for the purposes of accentuation.

28. The combination with a Variable tension pneumatic, and means forvarying the bers and normally movable independent of the other member toconnect said members to 1b move together at any predetermined setposition of the variable tension bellows.

GEORGE P. BRAND. Witnesses:

D. W. GARDNER, GEO. WM. MIATT.

